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-rw-r--r--synapse/config/registration.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index ac48913a0b..afb3e0b2a1 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -378,6 +378,8 @@ class RegistrationConfig(Config):
         # By default, any room aliases included in this list will be created
         # as a publicly joinable room when the first user registers for the
         # homeserver. This behaviour can be customised with the settings below.
+        # If the room already exists, make certain it is a publicly joinable
+        # room. The join rule of the room must be set to 'public'.
         #
         #auto_join_rooms:
         #  - "#example:example.com"